After leaving the British Secret Service, David Somers finds work catalouging butterflies at the country house of Nicholas and Jess Fenton. After the murder of a local gamekeeper, suspicion falls on their niece, Sophie Malraux. Somers helps Sophie to escape arrest and they go on the run together.
Kenneth More
Willy Shepley

Geoffrey Keen
Police Inspector

André Morell
Secret Service Chief Chubb (as Andre Morell)

Michael Brennan
Police Superintendent